wierd issue. Do you have a clue?

I’m looking for the exact same answer. I don’t have a clue, so sorry.

I did a find and replace of all twentyten and replaced it with my theme name.

You are working way to hard, and Twenty Ten is not right for that kind of work. It’s just too complex and as you found, simple search and replace does not work.

Try a framework such as Hybrid or Thematic, create your child theme for the framework and start styling, filtering, adding actions, etc. It’s just easier.

I’m not a guru and I’m not sure if this will work for you too, but I did the following and that worked for me, creating my own theme, based on twenty ten:

With ftp I got the directory wp-content/themes/twentyten down to my computer.
I renamed the directory there to my theme name. In all the files inside I ‘find and replace’d all twentyten to my theme name, as well as all Twenty Ten and Twenty_Ten.

In the stylesheet I also edited the description of the theme and the author.
Then, when I was sure there wasn’t any twenty ten left in the content any more I uploaded my theme directory with ftp up to wp-content/themes/mythemename.

Then it was visible in the backend (i believe it’s called) in appearence/themes. I simple activated the theme. The only things that were missing were the background and header image. Rest functions completely.

Hope this works for you too. Good luck!

I discovered that is was because the header.php file from my theme found it’s way into the root directory some how. I had to replace all files site wide and slowly worked backwards to figure it out.